Question

1. A RADIO HUT QUALITY INSPECTOR EXAMINES A SAMPLE OF 50 RADIOS AND FINDS THAT 5 ARE DEFECTIVE. WHAT IS THE BEST PREDICTION OF THE NUMBER OF DEFECTIVE RADIOS IN A DELIVERY OF 200 RADIOS? *

195 radios

5 radios

20 radios

50 radios

Answer 1

prob(defect) = 5/50 = 1/10

so what is 1/10 of 200 ??

Answer 2

20?

Answer 3

of course.